tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2002-2004, Instant802 Networks, Inc.
4 * Copyright 2008, Jouni Malinen <j@w1.fi>
5 * Copyright (C) 2016-2017 Intel Deutschland GmbH
6 * Copyright (C) 2020-2021 Intel Corporation
7 */
8
9#include <linux/netdevice.h>
10#include <linux/types.h>
11#include <linux/skbuff.h>
12#include <linux/compiler.h>
13#include <linux/ieee80211.h>
14#include <linux/gfp.h>
15#include <asm/unaligned.h>
16#include <net/mac80211.h>
17#include <crypto/aes.h>
18#include <crypto/algapi.h>
19
20#include "ieee80211_i.h"
21#include "michael.h"
22#include "tkip.h"
23#include "aes_ccm.h"
24#include "aes_cmac.h"
25#include "aes_gmac.h"
26#include "aes_gcm.h"
27#include "wpa.h"
28
29ieee80211_tx_result
30ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
31{
32 u8 *data, *key, *mic;
33 size_t data_len;
34 unsigned int hdrlen;
35 struct ieee80211_hdr *hdr;
36 struct sk_buff *skb = tx->skb;
37 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
38 int tail;
39
40 hdr = (struct ieee80211_hdr *)skb->data;
41 if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
42 skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control))
43 return TX_CONTINUE;
44
45 hdrlen = ieee80211_hdrlen(hdr->frame_control);
46 if (skb->len < hdrlen)
47 return TX_DROP;
48
49 data = skb->data + hdrlen;
50 data_len = skb->len - hdrlen;
51
52 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) {
53 /* Need to use software crypto for the test */
54 info->control.hw_key = NULL;
55 }
56
57 if (info->control.hw_key &&
58 (info->flags & IEEE80211_TX_CTL_DONTFRAG ||
59 ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) &&
60 !(tx->key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
61 IEEE80211_KEY_FLAG_PUT_MIC_SPACE))) {
62 /* hwaccel - with no need for SW-generated MMIC or MIC space */
63 return TX_CONTINUE;
64 }
65
66 tail = MICHAEL_MIC_LEN;
67 if (!info->control.hw_key)
68 tail += IEEE80211_TKIP_ICV_LEN;
69
70 if (WARN(skb_tailroom(skb) < tail ||
71 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN,
72 "mmic: not enough head/tail (%d/%d,%d/%d)\n",
73 skb_headroom(skb), IEEE80211_TKIP_IV_LEN,
74 skb_tailroom(skb), tail))
75 return TX_DROP;
76
77 mic = skb_put(skb, MICHAEL_MIC_LEN);
78
79 if (tx->key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) {
80 /* Zeroed MIC can help with debug */
81 memset(mic, 0, MICHAEL_MIC_LEN);
82 return TX_CONTINUE;
83 }
84
85 key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY];
86 michael_mic(key, hdr, data, data_len, mic);
87 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE))
88 mic[0]++;
89
90 return TX_CONTINUE;
91}
92
93
94ieee80211_rx_result
95ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
96{
97 u8 *data, *key = NULL;
98 size_t data_len;
99 unsigned int hdrlen;
100 u8 mic[MICHAEL_MIC_LEN];
101 struct sk_buff *skb = rx->skb;
102 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
103 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
104
105 /*
106 * it makes no sense to check for MIC errors on anything other
107 * than data frames.
108 */
109 if (!ieee80211_is_data_present(hdr->frame_control))
110 return RX_CONTINUE;
111
112 /*
113 * No way to verify the MIC if the hardware stripped it or
114 * the IV with the key index. In this case we have solely rely
115 * on the driver to set RX_FLAG_MMIC_ERROR in the event of a
116 * MIC failure report.
117 */
118 if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) {
119 if (status->flag & RX_FLAG_MMIC_ERROR)
120 goto mic_fail_no_key;
121
122 if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key &&
123 rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
124 goto update_iv;
125
126 return RX_CONTINUE;
127 }
128
129 /*
130 * Some hardware seems to generate Michael MIC failure reports; even
131 * though, the frame was not encrypted with TKIP and therefore has no
132 * MIC. Ignore the flag them to avoid triggering countermeasures.
133 */
134 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
135 !(status->flag & RX_FLAG_DECRYPTED))
136 return RX_CONTINUE;
137
138 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) {
139 /*
140 * APs with pairwise keys should never receive Michael MIC
141 * errors for non-zero keyidx because these are reserved for
142 * group keys and only the AP is sending real multicast
143 * frames in the BSS.
144 */
145 return RX_DROP_UNUSABLE;
146 }
147
148 if (status->flag & RX_FLAG_MMIC_ERROR)
149 goto mic_fail;
150
151 hdrlen = ieee80211_hdrlen(hdr->frame_control);
152 if (skb->len < hdrlen + MICHAEL_MIC_LEN)
153 return RX_DROP_UNUSABLE;
154
155 if (skb_linearize(rx->skb))
156 return RX_DROP_UNUSABLE;
157 hdr = (void *)skb->data;
158
159 data = skb->data + hdrlen;
160 data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
161 key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY];
162 michael_mic(key, hdr, data, data_len, mic);
163 if (crypto_memneq(mic, data + data_len, MICHAEL_MIC_LEN))
164 goto mic_fail;
165
166 /* remove Michael MIC from payload */
167 skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
168
169update_iv:
170 /* update IV in key information to be able to detect replays */
171 rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip.iv32;
172 rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip.iv16;
173
174 return RX_CONTINUE;
175
176mic_fail:
177 rx->key->u.tkip.mic_failures++;
178
179mic_fail_no_key:
180 /*
181 * In some cases the key can be unset - e.g. a multicast packet, in
182 * a driver that supports HW encryption. Send up the key idx only if
183 * the key is set.
184 */
185 cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2,
186 is_multicast_ether_addr(hdr->addr1) ?
187 NL80211_KEYTYPE_GROUP :
188 NL80211_KEYTYPE_PAIRWISE,
189 rx->key ? rx->key->conf.keyidx : -1,
190 NULL, GFP_ATOMIC);
191 return RX_DROP_UNUSABLE;
192}
193
194static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
195{
196 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
197 struct ieee80211_key *key = tx->key;
198 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
199 unsigned int hdrlen;
200 int len, tail;
201 u64 pn;
202 u8 *pos;
203
204 if (info->control.hw_key &&
205 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
206 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
207 /* hwaccel - with no need for software-generated IV */
208 return 0;
209 }
210
211 hdrlen = ieee80211_hdrlen(hdr->frame_control);
212 len = skb->len - hdrlen;
213
214 if (info->control.hw_key)
215 tail = 0;
216 else
217 tail = IEEE80211_TKIP_ICV_LEN;
218
219 if (WARN_ON(skb_tailroom(skb) < tail ||
220 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN))
221 return -1;
222
223 pos = skb_push(skb, IEEE80211_TKIP_IV_LEN);
224 memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen);
225 pos += hdrlen;
226
227 /* the HW only needs room for the IV, but not the actual IV */
228 if (info->control.hw_key &&
229 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
230 return 0;
231
232 /* Increase IV for the frame */
233 pn = atomic64_inc_return(&key->conf.tx_pn);
234 pos = ieee80211_tkip_add_iv(pos, &key->conf, pn);
235
236 /* hwaccel - with software IV */
237 if (info->control.hw_key)
238 return 0;
239
240 /* Add room for ICV */
241 skb_put(skb, IEEE80211_TKIP_ICV_LEN);
242
243 return ieee80211_tkip_encrypt_data(&tx->local->wep_tx_ctx,
244 key, skb, pos, len);
245}
246
247
248ieee80211_tx_result
249ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
250{
251 struct sk_buff *skb;
252
253 ieee80211_tx_set_protected(tx);
254
255 skb_queue_walk(&tx->skbs, skb) {
256 if (tkip_encrypt_skb(tx, skb) < 0)
257 return TX_DROP;
258 }
259
260 return TX_CONTINUE;
261}
262
263
264ieee80211_rx_result
265ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
266{
267 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
268 int hdrlen, res, hwaccel = 0;
269 struct ieee80211_key *key = rx->key;
270 struct sk_buff *skb = rx->skb;
271 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
272
273 hdrlen = ieee80211_hdrlen(hdr->frame_control);
274
275 if (!ieee80211_is_data(hdr->frame_control))
276 return RX_CONTINUE;
277
278 if (!rx->sta || skb->len - hdrlen < 12)
279 return RX_DROP_UNUSABLE;
280
281 /* it may be possible to optimize this a bit more */
282 if (skb_linearize(rx->skb))
283 return RX_DROP_UNUSABLE;
284 hdr = (void *)skb->data;
285
286 /*
287 * Let TKIP code verify IV, but skip decryption.
288 * In the case where hardware checks the IV as well,
289 * we don't even get here, see ieee80211_rx_h_decrypt()
290 */
291 if (status->flag & RX_FLAG_DECRYPTED)
292 hwaccel = 1;
293
294 res = ieee80211_tkip_decrypt_data(&rx->local->wep_rx_ctx,
295 key, skb->data + hdrlen,
296 skb->len - hdrlen, rx->sta->sta.addr,
297 hdr->addr1, hwaccel, rx->security_idx,
298 &rx->tkip.iv32,
299 &rx->tkip.iv16);
300 if (res != TKIP_DECRYPT_OK)
301 return RX_DROP_UNUSABLE;
302
303 /* Trim ICV */
304 if (!(status->flag & RX_FLAG_ICV_STRIPPED))
305 skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN);
306
307 /* Remove IV */
308 memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen);
309 skb_pull(skb, IEEE80211_TKIP_IV_LEN);
310
311 return RX_CONTINUE;
312}
313
314
315static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
316{
317 __le16 mask_fc;
318 int a4_included, mgmt;
319 u8 qos_tid;
320 u16 len_a;
321 unsigned int hdrlen;
322 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
323
324 /*
325 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
326 * Retry, PwrMgt, MoreData; set Protected
327 */
328 mgmt = ieee80211_is_mgmt(hdr->frame_control);
329 mask_fc = hdr->frame_control;
330 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
331 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
332 if (!mgmt)
333 mask_fc &= ~cpu_to_le16(0x0070);
334 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
335
336 hdrlen = ieee80211_hdrlen(hdr->frame_control);
337 len_a = hdrlen - 2;
338 a4_included = ieee80211_has_a4(hdr->frame_control);
339
340 if (ieee80211_is_data_qos(hdr->frame_control))
341 qos_tid = ieee80211_get_tid(hdr);
342 else
343 qos_tid = 0;
344
345 /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
346 * mode authentication are not allowed to collide, yet both are derived
347 * from this vector b_0. We only set L := 1 here to indicate that the
348 * data size can be represented in (L+1) bytes. The CCM layer will take
349 * care of storing the data length in the top (L+1) bytes and setting
350 * and clearing the other bits as is required to derive the two IVs.
351 */
352 b_0[0] = 0x1;
353
354 /* Nonce: Nonce Flags | A2 | PN
355 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
356 */
357 b_0[1] = qos_tid | (mgmt << 4);
358 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
359 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
360
361 /* AAD (extra authenticate-only data) / masked 802.11 header
362 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
363 put_unaligned_be16(len_a, &aad[0]);
364 put_unaligned(mask_fc, (__le16 *)&aad[2]);
365 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
366
367 /* Mask Seq#, leave Frag# */
368 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
369 aad[23] = 0;
370
371 if (a4_included) {
372 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
373 aad[30] = qos_tid;
374 aad[31] = 0;
375 } else {
376 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
377 aad[24] = qos_tid;
378 }
379}
380
381
382static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
383{
384 hdr[0] = pn[5];
385 hdr[1] = pn[4];
386 hdr[2] = 0;
387 hdr[3] = 0x20 | (key_id << 6);
388 hdr[4] = pn[3];
389 hdr[5] = pn[2];
390 hdr[6] = pn[1];
391 hdr[7] = pn[0];
392}
393
394
395static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
396{
397 pn[0] = hdr[7];
398 pn[1] = hdr[6];
399 pn[2] = hdr[5];
400 pn[3] = hdr[4];
401 pn[4] = hdr[1];
402 pn[5] = hdr[0];
403}
404
405
406static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
407 unsigned int mic_len)
408{
409 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
410 struct ieee80211_key *key = tx->key;
411 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
412 int hdrlen, len, tail;
413 u8 *pos;
414 u8 pn[6];
415 u64 pn64;
416 u8 aad[CCM_AAD_LEN];
417 u8 b_0[AES_BLOCK_SIZE];
418
419 if (info->control.hw_key &&
420 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
421 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
422 !((info->control.hw_key->flags &
423 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
424 ieee80211_is_mgmt(hdr->frame_control))) {
425 /*
426 * hwaccel has no need for preallocated room for CCMP
427 * header or MIC fields
428 */
429 return 0;
430 }
431
432 hdrlen = ieee80211_hdrlen(hdr->frame_control);
433 len = skb->len - hdrlen;
434
435 if (info->control.hw_key)
436 tail = 0;
437 else
438 tail = mic_len;
439
440 if (WARN_ON(skb_tailroom(skb) < tail ||
441 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
442 return -1;
443
444 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
445 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
446
447 /* the HW only needs room for the IV, but not the actual IV */
448 if (info->control.hw_key &&
449 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
450 return 0;
451
452 pos += hdrlen;
453
454 pn64 = atomic64_inc_return(&key->conf.tx_pn);
455
456 pn[5] = pn64;
457 pn[4] = pn64 >> 8;
458 pn[3] = pn64 >> 16;
459 pn[2] = pn64 >> 24;
460 pn[1] = pn64 >> 32;
461 pn[0] = pn64 >> 40;
462
463 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
464
465 /* hwaccel - with software CCMP header */
466 if (info->control.hw_key)
467 return 0;
468
469 pos += IEEE80211_CCMP_HDR_LEN;
470 ccmp_special_blocks(skb, pn, b_0, aad);
471 return ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
472 skb_put(skb, mic_len));
473}
474
475
476ieee80211_tx_result
477ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx,
478 unsigned int mic_len)
479{
480 struct sk_buff *skb;
481
482 ieee80211_tx_set_protected(tx);
483
484 skb_queue_walk(&tx->skbs, skb) {
485 if (ccmp_encrypt_skb(tx, skb, mic_len) < 0)
486 return TX_DROP;
487 }
488
489 return TX_CONTINUE;
490}
491
492
493ieee80211_rx_result
494ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
495 unsigned int mic_len)
496{
497 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
498 int hdrlen;
499 struct ieee80211_key *key = rx->key;
500 struct sk_buff *skb = rx->skb;
501 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
502 u8 pn[IEEE80211_CCMP_PN_LEN];
503 int data_len;
504 int queue;
505
506 hdrlen = ieee80211_hdrlen(hdr->frame_control);
507
508 if (!ieee80211_is_data(hdr->frame_control) &&
509 !ieee80211_is_robust_mgmt_frame(skb))
510 return RX_CONTINUE;
511
512 if (status->flag & RX_FLAG_DECRYPTED) {
513 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
514 return RX_DROP_UNUSABLE;
515 if (status->flag & RX_FLAG_MIC_STRIPPED)
516 mic_len = 0;
517 } else {
518 if (skb_linearize(rx->skb))
519 return RX_DROP_UNUSABLE;
520 }
521
522 /* reload hdr - skb might have been reallocated */
523 hdr = (void *)rx->skb->data;
524
525 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
526 if (!rx->sta || data_len < 0)
527 return RX_DROP_UNUSABLE;
528
529 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
530 int res;
531
532 ccmp_hdr2pn(pn, skb->data + hdrlen);
533
534 queue = rx->security_idx;
535
536 res = memcmp(pn, key->u.ccmp.rx_pn[queue],
537 IEEE80211_CCMP_PN_LEN);
538 if (res < 0 ||
539 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
540 key->u.ccmp.replays++;
541 return RX_DROP_UNUSABLE;
542 }
543
544 if (!(status->flag & RX_FLAG_DECRYPTED)) {
545 u8 aad[2 * AES_BLOCK_SIZE];
546 u8 b_0[AES_BLOCK_SIZE];
547 /* hardware didn't decrypt/verify MIC */
548 ccmp_special_blocks(skb, pn, b_0, aad);
549
550 if (ieee80211_aes_ccm_decrypt(
551 key->u.ccmp.tfm, b_0, aad,
552 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
553 data_len,
554 skb->data + skb->len - mic_len))
555 return RX_DROP_UNUSABLE;
556 }
557
558 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
559 if (unlikely(ieee80211_is_frag(hdr)))
560 memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN);
561 }
562
563 /* Remove CCMP header and MIC */
564 if (pskb_trim(skb, skb->len - mic_len))
565 return RX_DROP_UNUSABLE;
566 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
567 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
568
569 return RX_CONTINUE;
570}
571
572static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
573{
574 __le16 mask_fc;
575 u8 qos_tid;
576 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
577
578 memcpy(j_0, hdr->addr2, ETH_ALEN);
579 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
580 j_0[13] = 0;
581 j_0[14] = 0;
582 j_0[AES_BLOCK_SIZE - 1] = 0x01;
583
584 /* AAD (extra authenticate-only data) / masked 802.11 header
585 * FC | A1 | A2 | A3 | SC | [A4] | [QC]
586 */
587 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
588 /* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
589 * Retry, PwrMgt, MoreData; set Protected
590 */
591 mask_fc = hdr->frame_control;
592 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
593 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
594 if (!ieee80211_is_mgmt(hdr->frame_control))
595 mask_fc &= ~cpu_to_le16(0x0070);
596 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
597
598 put_unaligned(mask_fc, (__le16 *)&aad[2]);
599 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
600
601 /* Mask Seq#, leave Frag# */
602 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
603 aad[23] = 0;
604
605 if (ieee80211_is_data_qos(hdr->frame_control))
606 qos_tid = ieee80211_get_tid(hdr);
607 else
608 qos_tid = 0;
609
610 if (ieee80211_has_a4(hdr->frame_control)) {
611 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
612 aad[30] = qos_tid;
613 aad[31] = 0;
614 } else {
615 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
616 aad[24] = qos_tid;
617 }
618}
619
620static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
621{
622 hdr[0] = pn[5];
623 hdr[1] = pn[4];
624 hdr[2] = 0;
625 hdr[3] = 0x20 | (key_id << 6);
626 hdr[4] = pn[3];
627 hdr[5] = pn[2];
628 hdr[6] = pn[1];
629 hdr[7] = pn[0];
630}
631
632static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr)
633{
634 pn[0] = hdr[7];
635 pn[1] = hdr[6];
636 pn[2] = hdr[5];
637 pn[3] = hdr[4];
638 pn[4] = hdr[1];
639 pn[5] = hdr[0];
640}
641
642static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
643{
644 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
645 struct ieee80211_key *key = tx->key;
646 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
647 int hdrlen, len, tail;
648 u8 *pos;
649 u8 pn[6];
650 u64 pn64;
651 u8 aad[GCM_AAD_LEN];
652 u8 j_0[AES_BLOCK_SIZE];
653
654 if (info->control.hw_key &&
655 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
656 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
657 !((info->control.hw_key->flags &
658 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
659 ieee80211_is_mgmt(hdr->frame_control))) {
660 /* hwaccel has no need for preallocated room for GCMP
661 * header or MIC fields
662 */
663 return 0;
664 }
665
666 hdrlen = ieee80211_hdrlen(hdr->frame_control);
667 len = skb->len - hdrlen;
668
669 if (info->control.hw_key)
670 tail = 0;
671 else
672 tail = IEEE80211_GCMP_MIC_LEN;
673
674 if (WARN_ON(skb_tailroom(skb) < tail ||
675 skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN))
676 return -1;
677
678 pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
679 memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
680 skb_set_network_header(skb, skb_network_offset(skb) +
681 IEEE80211_GCMP_HDR_LEN);
682
683 /* the HW only needs room for the IV, but not the actual IV */
684 if (info->control.hw_key &&
685 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
686 return 0;
687
688 pos += hdrlen;
689
690 pn64 = atomic64_inc_return(&key->conf.tx_pn);
691
692 pn[5] = pn64;
693 pn[4] = pn64 >> 8;
694 pn[3] = pn64 >> 16;
695 pn[2] = pn64 >> 24;
696 pn[1] = pn64 >> 32;
697 pn[0] = pn64 >> 40;
698
699 gcmp_pn2hdr(pos, pn, key->conf.keyidx);
700
701 /* hwaccel - with software GCMP header */
702 if (info->control.hw_key)
703 return 0;
704
705 pos += IEEE80211_GCMP_HDR_LEN;
706 gcmp_special_blocks(skb, pn, j_0, aad);
707 return ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
708 skb_put(skb, IEEE80211_GCMP_MIC_LEN));
709}
710
711ieee80211_tx_result
712ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
713{
714 struct sk_buff *skb;
715
716 ieee80211_tx_set_protected(tx);
717
718 skb_queue_walk(&tx->skbs, skb) {
719 if (gcmp_encrypt_skb(tx, skb) < 0)
720 return TX_DROP;
721 }
722
723 return TX_CONTINUE;
724}
725
726ieee80211_rx_result
727ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
728{
729 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
730 int hdrlen;
731 struct ieee80211_key *key = rx->key;
732 struct sk_buff *skb = rx->skb;
733 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
734 u8 pn[IEEE80211_GCMP_PN_LEN];
735 int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN;
736
737 hdrlen = ieee80211_hdrlen(hdr->frame_control);
738
739 if (!ieee80211_is_data(hdr->frame_control) &&
740 !ieee80211_is_robust_mgmt_frame(skb))
741 return RX_CONTINUE;
742
743 if (status->flag & RX_FLAG_DECRYPTED) {
744 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
745 return RX_DROP_UNUSABLE;
746 if (status->flag & RX_FLAG_MIC_STRIPPED)
747 mic_len = 0;
748 } else {
749 if (skb_linearize(rx->skb))
750 return RX_DROP_UNUSABLE;
751 }
752
753 /* reload hdr - skb might have been reallocated */
754 hdr = (void *)rx->skb->data;
755
756 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len;
757 if (!rx->sta || data_len < 0)
758 return RX_DROP_UNUSABLE;
759
760 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
761 int res;
762
763 gcmp_hdr2pn(pn, skb->data + hdrlen);
764
765 queue = rx->security_idx;
766
767 res = memcmp(pn, key->u.gcmp.rx_pn[queue],
768 IEEE80211_GCMP_PN_LEN);
769 if (res < 0 ||
770 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
771 key->u.gcmp.replays++;
772 return RX_DROP_UNUSABLE;
773 }
774
775 if (!(status->flag & RX_FLAG_DECRYPTED)) {
776 u8 aad[2 * AES_BLOCK_SIZE];
777 u8 j_0[AES_BLOCK_SIZE];
778 /* hardware didn't decrypt/verify MIC */
779 gcmp_special_blocks(skb, pn, j_0, aad);
780
781 if (ieee80211_aes_gcm_decrypt(
782 key->u.gcmp.tfm, j_0, aad,
783 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
784 data_len,
785 skb->data + skb->len -
786 IEEE80211_GCMP_MIC_LEN))
787 return RX_DROP_UNUSABLE;
788 }
789
790 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
791 if (unlikely(ieee80211_is_frag(hdr)))
792 memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN);
793 }
794
795 /* Remove GCMP header and MIC */
796 if (pskb_trim(skb, skb->len - mic_len))
797 return RX_DROP_UNUSABLE;
798 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
799 skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
800
801 return RX_CONTINUE;
802}
803
804static ieee80211_tx_result
805ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
806 struct sk_buff *skb)
807{
808 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
809 struct ieee80211_key *key = tx->key;
810 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
811 int hdrlen;
812 u8 *pos, iv_len = key->conf.iv_len;
813
814 if (info->control.hw_key &&
815 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
816 /* hwaccel has no need for preallocated head room */
817 return TX_CONTINUE;
818 }
819
820 if (unlikely(skb_headroom(skb) < iv_len &&
821 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC)))
822 return TX_DROP;
823
824 hdrlen = ieee80211_hdrlen(hdr->frame_control);
825
826 pos = skb_push(skb, iv_len);
827 memmove(pos, pos + iv_len, hdrlen);
828
829 return TX_CONTINUE;
830}
831
832static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len)
833{
834 int i;
835
836 /* pn is little endian */
837 for (i = len - 1; i >= 0; i--) {
838 if (pn1[i] < pn2[i])
839 return -1;
840 else if (pn1[i] > pn2[i])
841 return 1;
842 }
843
844 return 0;
845}
846
847static ieee80211_rx_result
848ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx)
849{
850 struct ieee80211_key *key = rx->key;
851 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
852 const struct ieee80211_cipher_scheme *cs = NULL;
853 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
854 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
855 int data_len;
856 u8 *rx_pn;
857 u8 *skb_pn;
858 u8 qos_tid;
859
860 if (!rx->sta || !rx->sta->cipher_scheme ||
861 !(status->flag & RX_FLAG_DECRYPTED))
862 return RX_DROP_UNUSABLE;
863
864 if (!ieee80211_is_data(hdr->frame_control))
865 return RX_CONTINUE;
866
867 cs = rx->sta->cipher_scheme;
868
869 data_len = rx->skb->len - hdrlen - cs->hdr_len;
870
871 if (data_len < 0)
872 return RX_DROP_UNUSABLE;
873
874 if (ieee80211_is_data_qos(hdr->frame_control))
875 qos_tid = ieee80211_get_tid(hdr);
876 else
877 qos_tid = 0;
878
879 if (skb_linearize(rx->skb))
880 return RX_DROP_UNUSABLE;
881
882 rx_pn = key->u.gen.rx_pn[qos_tid];
883 skb_pn = rx->skb->data + hdrlen + cs->pn_off;
884
885 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0)
886 return RX_DROP_UNUSABLE;
887
888 memcpy(rx_pn, skb_pn, cs->pn_len);
889
890 /* remove security header and MIC */
891 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len))
892 return RX_DROP_UNUSABLE;
893
894 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen);
895 skb_pull(rx->skb, cs->hdr_len);
896
897 return RX_CONTINUE;
898}
899
900static void bip_aad(struct sk_buff *skb, u8 *aad)
901{
902 __le16 mask_fc;
903 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
904
905 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
906
907 /* FC type/subtype */
908 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
909 mask_fc = hdr->frame_control;
910 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
911 IEEE80211_FCTL_MOREDATA);
912 put_unaligned(mask_fc, (__le16 *) &aad[0]);
913 /* A1 || A2 || A3 */
914 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
915}
916
917
918static inline void bip_ipn_set64(u8 *d, u64 pn)
919{
920 *d++ = pn;
921 *d++ = pn >> 8;
922 *d++ = pn >> 16;
923 *d++ = pn >> 24;
924 *d++ = pn >> 32;
925 *d = pn >> 40;
926}
927
928static inline void bip_ipn_swap(u8 *d, const u8 *s)
929{
930 *d++ = s[5];
931 *d++ = s[4];
932 *d++ = s[3];
933 *d++ = s[2];
934 *d++ = s[1];
935 *d = s[0];
936}
937
938
939ieee80211_tx_result
940ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
941{
942 struct sk_buff *skb;
943 struct ieee80211_tx_info *info;
944 struct ieee80211_key *key = tx->key;
945 struct ieee80211_mmie *mmie;
946 u8 aad[20];
947 u64 pn64;
948
949 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
950 return TX_DROP;
951
952 skb = skb_peek(&tx->skbs);
953
954 info = IEEE80211_SKB_CB(skb);
955
956 if (info->control.hw_key &&
957 !(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIE))
958 return TX_CONTINUE;
959
960 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
961 return TX_DROP;
962
963 mmie = skb_put(skb, sizeof(*mmie));
964 mmie->element_id = WLAN_EID_MMIE;
965 mmie->length = sizeof(*mmie) - 2;
966 mmie->key_id = cpu_to_le16(key->conf.keyidx);
967
968 /* PN = PN + 1 */
969 pn64 = atomic64_inc_return(&key->conf.tx_pn);
970
971 bip_ipn_set64(mmie->sequence_number, pn64);
972
973 if (info->control.hw_key)
974 return TX_CONTINUE;
975
976 bip_aad(skb, aad);
977
978 /*
979 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
980 */
981 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
982 skb->data + 24, skb->len - 24, mmie->mic);
983
984 return TX_CONTINUE;
985}
986
987ieee80211_tx_result
988ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
989{
990 struct sk_buff *skb;
991 struct ieee80211_tx_info *info;
992 struct ieee80211_key *key = tx->key;
993 struct ieee80211_mmie_16 *mmie;
994 u8 aad[20];
995 u64 pn64;
996
997 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
998 return TX_DROP;
999
1000 skb = skb_peek(&tx->skbs);
1001
1002 info = IEEE80211_SKB_CB(skb);
1003
1004 if (info->control.hw_key)
1005 return TX_CONTINUE;
1006
1007 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1008 return TX_DROP;
1009
1010 mmie = skb_put(skb, sizeof(*mmie));
1011 mmie->element_id = WLAN_EID_MMIE;
1012 mmie->length = sizeof(*mmie) - 2;
1013 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1014
1015 /* PN = PN + 1 */
1016 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1017
1018 bip_ipn_set64(mmie->sequence_number, pn64);
1019
1020 bip_aad(skb, aad);
1021
1022 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
1023 */
1024 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1025 skb->data + 24, skb->len - 24, mmie->mic);
1026
1027 return TX_CONTINUE;
1028}
1029
1030ieee80211_rx_result
1031ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
1032{
1033 struct sk_buff *skb = rx->skb;
1034 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1035 struct ieee80211_key *key = rx->key;
1036 struct ieee80211_mmie *mmie;
1037 u8 aad[20], mic[8], ipn[6];
1038 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1039
1040 if (!ieee80211_is_mgmt(hdr->frame_control))
1041 return RX_CONTINUE;
1042
1043 /* management frames are already linear */
1044
1045 if (skb->len < 24 + sizeof(*mmie))
1046 return RX_DROP_UNUSABLE;
1047
1048 mmie = (struct ieee80211_mmie *)
1049 (skb->data + skb->len - sizeof(*mmie));
1050 if (mmie->element_id != WLAN_EID_MMIE ||
1051 mmie->length != sizeof(*mmie) - 2)
1052 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1053
1054 bip_ipn_swap(ipn, mmie->sequence_number);
1055
1056 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1057 key->u.aes_cmac.replays++;
1058 return RX_DROP_UNUSABLE;
1059 }
1060
1061 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1062 /* hardware didn't decrypt/verify MIC */
1063 bip_aad(skb, aad);
1064 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
1065 skb->data + 24, skb->len - 24, mic);
1066 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1067 key->u.aes_cmac.icverrors++;
1068 return RX_DROP_UNUSABLE;
1069 }
1070 }
1071
1072 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1073
1074 /* Remove MMIE */
1075 skb_trim(skb, skb->len - sizeof(*mmie));
1076
1077 return RX_CONTINUE;
1078}
1079
1080ieee80211_rx_result
1081ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
1082{
1083 struct sk_buff *skb = rx->skb;
1084 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1085 struct ieee80211_key *key = rx->key;
1086 struct ieee80211_mmie_16 *mmie;
1087 u8 aad[20], mic[16], ipn[6];
1088 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1089
1090 if (!ieee80211_is_mgmt(hdr->frame_control))
1091 return RX_CONTINUE;
1092
1093 /* management frames are already linear */
1094
1095 if (skb->len < 24 + sizeof(*mmie))
1096 return RX_DROP_UNUSABLE;
1097
1098 mmie = (struct ieee80211_mmie_16 *)
1099 (skb->data + skb->len - sizeof(*mmie));
1100 if (mmie->element_id != WLAN_EID_MMIE ||
1101 mmie->length != sizeof(*mmie) - 2)
1102 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1103
1104 bip_ipn_swap(ipn, mmie->sequence_number);
1105
1106 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1107 key->u.aes_cmac.replays++;
1108 return RX_DROP_UNUSABLE;
1109 }
1110
1111 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1112 /* hardware didn't decrypt/verify MIC */
1113 bip_aad(skb, aad);
1114 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1115 skb->data + 24, skb->len - 24, mic);
1116 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1117 key->u.aes_cmac.icverrors++;
1118 return RX_DROP_UNUSABLE;
1119 }
1120 }
1121
1122 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1123
1124 /* Remove MMIE */
1125 skb_trim(skb, skb->len - sizeof(*mmie));
1126
1127 return RX_CONTINUE;
1128}
1129
1130ieee80211_tx_result
1131ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
1132{
1133 struct sk_buff *skb;
1134 struct ieee80211_tx_info *info;
1135 struct ieee80211_key *key = tx->key;
1136 struct ieee80211_mmie_16 *mmie;
1137 struct ieee80211_hdr *hdr;
1138 u8 aad[GMAC_AAD_LEN];
1139 u64 pn64;
1140 u8 nonce[GMAC_NONCE_LEN];
1141
1142 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1143 return TX_DROP;
1144
1145 skb = skb_peek(&tx->skbs);
1146
1147 info = IEEE80211_SKB_CB(skb);
1148
1149 if (info->control.hw_key)
1150 return TX_CONTINUE;
1151
1152 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1153 return TX_DROP;
1154
1155 mmie = skb_put(skb, sizeof(*mmie));
1156 mmie->element_id = WLAN_EID_MMIE;
1157 mmie->length = sizeof(*mmie) - 2;
1158 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1159
1160 /* PN = PN + 1 */
1161 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1162
1163 bip_ipn_set64(mmie->sequence_number, pn64);
1164
1165 bip_aad(skb, aad);
1166
1167 hdr = (struct ieee80211_hdr *)skb->data;
1168 memcpy(nonce, hdr->addr2, ETH_ALEN);
1169 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
1170
1171 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
1172 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1173 skb->data + 24, skb->len - 24, mmie->mic) < 0)
1174 return TX_DROP;
1175
1176 return TX_CONTINUE;
1177}
1178
1179ieee80211_rx_result
1180ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
1181{
1182 struct sk_buff *skb = rx->skb;
1183 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1184 struct ieee80211_key *key = rx->key;
1185 struct ieee80211_mmie_16 *mmie;
1186 u8 aad[GMAC_AAD_LEN], *mic, ipn[6], nonce[GMAC_NONCE_LEN];
1187 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1188
1189 if (!ieee80211_is_mgmt(hdr->frame_control))
1190 return RX_CONTINUE;
1191
1192 /* management frames are already linear */
1193
1194 if (skb->len < 24 + sizeof(*mmie))
1195 return RX_DROP_UNUSABLE;
1196
1197 mmie = (struct ieee80211_mmie_16 *)
1198 (skb->data + skb->len - sizeof(*mmie));
1199 if (mmie->element_id != WLAN_EID_MMIE ||
1200 mmie->length != sizeof(*mmie) - 2)
1201 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1202
1203 bip_ipn_swap(ipn, mmie->sequence_number);
1204
1205 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
1206 key->u.aes_gmac.replays++;
1207 return RX_DROP_UNUSABLE;
1208 }
1209
1210 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1211 /* hardware didn't decrypt/verify MIC */
1212 bip_aad(skb, aad);
1213
1214 memcpy(nonce, hdr->addr2, ETH_ALEN);
1215 memcpy(nonce + ETH_ALEN, ipn, 6);
1216
1217 mic = kmalloc(GMAC_MIC_LEN, GFP_ATOMIC);
1218 if (!mic)
1219 return RX_DROP_UNUSABLE;
1220 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1221 skb->data + 24, skb->len - 24,
1222 mic) < 0 ||
1223 crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1224 key->u.aes_gmac.icverrors++;
1225 kfree(mic);
1226 return RX_DROP_UNUSABLE;
1227 }
1228 kfree(mic);
1229 }
1230
1231 memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
1232
1233 /* Remove MMIE */
1234 skb_trim(skb, skb->len - sizeof(*mmie));
1235
1236 return RX_CONTINUE;
1237}
1238
1239ieee80211_tx_result
1240ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
1241{
1242 struct sk_buff *skb;
1243 struct ieee80211_tx_info *info = NULL;
1244 ieee80211_tx_result res;
1245
1246 skb_queue_walk(&tx->skbs, skb) {
1247 info = IEEE80211_SKB_CB(skb);
1248
1249 /* handle hw-only algorithm */
1250 if (!info->control.hw_key)
1251 return TX_DROP;
1252
1253 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) {
1254 res = ieee80211_crypto_cs_encrypt(tx, skb);
1255 if (res != TX_CONTINUE)
1256 return res;
1257 }
1258 }
1259
1260 ieee80211_tx_set_protected(tx);
1261
1262 return TX_CONTINUE;
1263}
1264
1265ieee80211_rx_result
1266ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
1267{
1268 if (rx->sta && rx->sta->cipher_scheme)
1269 return ieee80211_crypto_cs_decrypt(rx);
1270
1271 return RX_DROP_UNUSABLE;
1272}